Curable coating compositions

• US 6,428,616 B1
• Filed: 07/19/2000
• Issued: 08/06/2002
• Est. Priority Date: 07/19/2000
• Status: Expired due to Term

• Current Assignee: Neely Industries, Inc.
• Original Assignee: Neely Industries, Inc.
• Inventors: Neely, James E. Jr.
• Primary Examiner(s): Wood, Elizabeth D.
• Application Number:
  US09/619,335
• Time in Patent Office: 748 Days
• Field of Search: 106/628, 106/629, 427/397.8, 428/426, 428/427, 428/428, 428/432, 428/688, 428/689
• US Class Current: 106/628
• CPC Class Codes: C03C 17/22 with other inorganic material C03C17/34, C03C17/44 take precedence
• CPC Class Codes: C04B 2111/00482 Coating or impregnation materials
• CPC Class Codes: C04B 22/0013 Boron compounds
• CPC Class Codes: C04B 22/16 containing phosphorus in the anion, e.g. phosphates
• CPC Class Codes: C04B 28/26 Silicates of the alkali metals
• CPC Class Codes: C04B 40/0263 Hardening promoted by a rise in temperature C04B40/024 takes precedence
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/5089 Silica sols, alkyl, ammonium or alkali metal silicate cements
• CPC Class Codes: C09D 1/02 alkali metal silicates
• CPC Class Codes: C23C 26/00 Coating not provided for in groups C23C2/00 - C23C24/00
• CPC Class Codes: C23C 30/00 Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process C23C26/00, C23C28/00 take precedence
• CPC Class Codes: H01B 3/025 Other inorganic material

Abstract

An aqueous, curable coating composition comprising a mixture of:

(a) at least one water soluble alkali metal silicate; and

(b) an effective amount of a water-soluble crosslinking agent comprising an alkali metal aluminophosphate, or an alkali metal aluminoborophosphate, or an ammonia aluminophosphate, or an ammonia aluminoborophosphate, or an alkali metal ammonia aluminophosphate, an alkali metal ammonia aluminoborophosphate, or a mixture of two or more of the foregoing phosphates.

Preferably, the coating composition will not contain any visually discernable precipitate. The coating composition may be applied to a substrate such as a glass, a ceramic, concrete or a metal and thereafter cured by air drying or by heating to a temperature of up to about 240° C. (or higher, if desired).

Claims

1. An aqueous, curable coating composition comprising a mixture of:

(a) at least one water-soluble alkali metal silicate; and

(b) an effective amount of a water-soluble crosslinking agent comprising an alkali metal aluminophosphate, or an alkali metal aluminoborophosphate, or an ammonia aluminophosphate, or an ammonia aluminoborophosphate, or an alkali metal ammonia aluminophosphate, or an alkali metal ammonia aluminoborophosphate, or a mixture of two or more of the foregoing phosphates.

2. The composition of claim 1 wherein the weight ratio of solids of the water-soluble alkali metal silicate to the water-soluble crosslinking agent is in the range of about 3:

1 to about 500;

1.

3. The composition of claim 2 wherein the weight ratio of solids of the water-soluble alkali metal silicate to the water-soluble crosslinking agent is in the range of 10:

1 to 100;

1.

4. The composition of claim 1 wherein an aqueous solution of the crosslinking agent is such that no visually discernable solids are present in the solution.

5. The composition of claim 1 wherein an aqueous solution of the crosslinking agent has a pH above about 5.0.

6. The composition of claim 5 wherein the pH of the aqueous solution of the crosslinking agent is above 7.0.

7. The composition of claim 1 further comprising at least one material selected from the group consisting of one or more resins, one or more fillers, one or more inorganic pigments, one or more organic pigments, one or more dyes, one or more surfactants, one or more defoamers and one or more coupling agents and mixtures thereof.

8. The composition of claim 7 wherein the total amount of all materials present in the composition is not greater than about 90 wt. %, based on the weight of the composition.

9. The composition of claim 7 wherein the total amount of all resins present in the composition is not greater than about 90 wt. %, based on the weight of the composition.

10. The composition of claim 7 wherein the total amount of all fillers present in the composition is not greater than about 60 wt. %, based on the weight of the composition.

11. The composition of claim 7 wherein the total amount of all inorganic pigments present in the composition is not greater than about 50 wt. %, based on the weight of the composition.

12. The composition of claim 7 wherein the total amount of all in organic pigments present in the composition is not greater than about 40 wt. %, based on the weight of the composition.

13. The composition of claim 1 wherein the alkali metal of the water-soluble alkali metal silicate and each of the alkali metals of the water-soluble crosslinking agent independently comprise sodium, potassium or lithium.

14. A method for preparing a coated substrate that comprises applying the composition of claim 1 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

15. The method of claim 14 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

16. A method for preparing a coated substrate that comprises applying the composition of claim 7 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

17. The method of claim 16 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

18. A method for preparing a coated substrate that comprises applying the composition of claim 8 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

19. The method of claim 18 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

20. A method for preparing a coated substrate that comprises applying the composition of claim 9 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

21. The method of claim 20 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

22. A method for preparing a coated substrate that comprises applying the composition of claim 10 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

23. The method of claim 22 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

24. A method for preparing a coated substrate that comprises applying the composition of claim 11 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

25. The method of claim 24 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

26. A method for preparing a coated substrate that comprises applying the composition of claim 12 to such substrate and subjecting the resultant substrate to curing by air drying or by heating to a temperature of up to about 240°

C.

27. The method of claim 26 wherein the substrate comprises a glass, a ceramic, concrete or a metal.

28. A coated glass, ceramic, concrete or metal substrate prepared in accordance with any of claims 14, 16, 18, 20, 22, 24 or 26.